WO2023282227A1 - 細胞操作用溶液、細胞凍結保存方法及び細胞融解方法 - Google Patents
細胞操作用溶液、細胞凍結保存方法及び細胞融解方法 Download PDFInfo
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- WO2023282227A1 WO2023282227A1 PCT/JP2022/026582 JP2022026582W WO2023282227A1 WO 2023282227 A1 WO2023282227 A1 WO 2023282227A1 JP 2022026582 W JP2022026582 W JP 2022026582W WO 2023282227 A1 WO2023282227 A1 WO 2023282227A1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/04—Preserving or maintaining viable microorganisms
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M1/00—Apparatus for enzymology or microbiology
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M3/00—Tissue, human, animal or plant cell, or virus culture apparatus
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
Definitions
- the present invention relates to a cell manipulation solution for cryopreserving cells, a cell cryopreservation method and a cell thawing method using this cell manipulation solution.
- cryopreservation of eggs and embryos has attracted attention in human infertility treatment.
- a cryopreservation method for mammalian ova, etc. eggs, embryos, etc. are covered with a vitrification liquid and attached to vials, straws, etc., and after sealing the cryopreservation container, they are brought into contact with liquid nitrogen.
- a method for rapid cooling is known (for example, Patent Document 1).
- Kuwayama et al. reported a vitrification preservation technique that can preserve fertilized eggs with little damage.
- This preservation solution does not contain serum and contains at least one water-soluble cellulosic cryoprotectant selected from the group consisting of hydroxypropylcellulose, hydroxypropylmethylcellulose, and hydroxyethylmethylcellulose as a cryoprotectant.
- the vitrification solution for cells (fertilized eggs) is required to have characteristics such as easy handling of cells during cryopreservation operations.
- the cryopreservation operation is required to be easily performed in consideration of the load on the cells, shortening the working time.
- an object of the present invention is to provide a cell manipulation solution that improves the operability of cells, a cell cryopreservation method and a cell thawing method using this cell manipulation solution.
- the cell manipulation solution according to the present invention is used for vitrification-freezing of cells or thawing of vitrified-frozen cells, and contains a thickening agent, which is xanthan gum, carrageenan, gellan gum. , locust bean gum, guar gum, and diutan gum.
- a thickening agent which is xanthan gum, carrageenan, gellan gum. , locust bean gum, guar gum, and diutan gum.
- the cell manipulation solution according to the present invention is characterized by having a thickener concentration of 0.01% by mass to 0.50% by mass and a viscosity of 1.5 mPa ⁇ s to 100 mPa ⁇ s.
- the cell manipulation solution according to the present invention contains at least one selected from cell membrane permeable cryoprotectants such as dimethylsulfoxide, ethylene glycol, glycerol, propylene glycol and butanediol, and includes trehalose, polyvinylpyrrolidone, sucrose and polyethylene. It is characterized by containing at least one selected from glycol cell membrane impermeable cryoprotective substances.
- cell membrane permeable cryoprotectants such as dimethylsulfoxide, ethylene glycol, glycerol, propylene glycol and butanediol
- trehalose polyvinylpyrrolidone
- sucrose sucrose
- polyethylene polyethylene
- the cell cryopreservation method uses a plate having at least a first well and a second well filled with the above cell manipulation solution, and the first cell manipulation solution filled in the first well is A first step in which the viscosity of the thickener is lower than that of the second cell manipulation solution filled in the second well, and the cells are immersed in the first cell manipulation solution in the first well. After the first step, the cells are removed from the first cell manipulation solution in the first well and immersed in the second cell manipulation solution in the second well; and a third step of removing from the second cell manipulation solution in the two wells and freezing.
- the cell lysis method according to the present invention is a cell lysis method in which cells are thawed using a plate having first, second, third, and fourth wells filled with the cell manipulation solution.
- the viscosity of the thickener in the fourth cell manipulation solution filled in the fourth well is a first step of immersing the cells in the fourth cell manipulation solution in the fourth well and thawing the cells, which has a higher viscosity than the thickening agent in the solution and the third cell manipulation solution filled in the third well; , after the first step, the cells are removed from the fourth cell manipulation solution in the fourth well and immersed in the first cell manipulation solution in the first well; and a third step of removing from the first cell manipulation solution in the well and immersing in the second cell manipulation solution in the second well.
- the cell manipulation solution of the present invention contains a thickening agent.
- the thickening agent contains at least one of xanthan gum, carrageenan, gellan gum, locust bean gum, guar gum and diutan gum.
- the above cell manipulation solution is used as the equilibrium liquid and the vitrification liquid, and the vitrification liquid has a low viscosity thickening agent as the equilibrium liquid.
- the cells After immersing the cells in the equilibration solution, the cells are immersed in a vitrification solution and frozen.
- This cell cryopreservation method improves the operability of cells and enables cells to be vitrified in a shorter time than conventional methods.
- the cell manipulation solution is used as the thawing liquid, diluent and washing liquid, and the viscosity of the thickening agent in the thawing liquid is made higher than that of the diluent and washing liquid.
- the cells are immersed in the lysing solution, they are immersed in the diluent and then in the washing solution.
- FIG. 1 is a perspective view of a cell freezing instrument filled with a cell manipulation solution according to a first embodiment of the present invention
- FIG. 1 is a cross-sectional view of a cell freezing instrument filled with a cell manipulation solution according to a first embodiment of the present invention
- FIG. Fig. 2 is a perspective view of a cell lysis instrument filled with a cell manipulation solution according to a second embodiment of the present invention
- FIG. 4 is a cross-sectional view of a cell lysis instrument filled with a cell manipulation solution according to a second embodiment of the present invention.
- the cell manipulation solution according to this embodiment is used as a cell vitrification solution.
- This cell vitrification solution is used, for example, when cryopreserving mammalian sperm, ova, and embryos.
- This cell vitrification solution contains a thickener, for example, at least one of polysaccharide thickeners such as xanthan gum, carrageenan, gellan gum, locust bean gum, guar gum, and diutan gum. Hydroxypropylcellulose, hydroxypropylmethylcellulose and hydroxyethylmethylcellulose are not contained.
- the thickener is preferably contained at a concentration of 0.01% by mass to 0.50% by mass with respect to the cell vitrification solution. Moreover, it is most preferable that it is 0.03 mass % to 0.30 mass %. If the concentration of the thickening agent is lower than 0.01% by mass, the thickening effect is lost, and the cells may come into contact with each other in the cell vitrification solution and adhere to each other. Operability is sometimes reduced. On the other hand, when the concentration of the thickening agent is higher than 0.50% by mass, the viscosity of the cell vitrification solution increases, and the operability of cells in the cell vitrification solution decreases.
- the viscosity of the cell vitrification solution is preferably from 1.5 mPa ⁇ s to 100 mPa ⁇ s. If the viscosity of the cell vitrification solution is less than 1.5 mPa s, the cells may come into contact with each other in the cell vitrification solution and adhere to each other, resulting in reduced operability when handling a single cell. do. On the other hand, if it is more than 100 mPa ⁇ s, it becomes difficult to take out the cells from the cell vitrification solution, and the operability of the cells decreases. The viscosity of each solution was measured using a tuning fork vibration viscometer (22° ⁇ 1.0°).
- the cell vitrification solution contains multiple salts, multiple amino acids, multiple buffers, etc. Furthermore, this cell vitrification solution contains at least one selected from cell membrane permeable cryoprotectants such as dimethyl sulfoxide, ethylene glycol, glycerol, propylene glycol and butanediol, trehalose, polyvinylpyrrolidone, sucrose, At least one selected from cell membrane impermeable cryoprotective substances such as polyethylene glycol is included.
- cell membrane permeable cryoprotectants such as dimethyl sulfoxide, ethylene glycol, glycerol, propylene glycol and butanediol, trehalose, polyvinylpyrrolidone, sucrose.
- cell membrane impermeable cryoprotective substances such as polyethylene glycol is included.
- FIG. 1 This cell freezing instrument 1 can be used when freezing various cells.
- a case of use when freezing a fertilized egg (blastocyst) will be described as an example.
- the cell freezing instrument 1 includes a plate body 2 and a lid 3 that covers the plate body 2 from above.
- the longitudinal direction of the plate body 2 is referred to as the left-right direction X
- the widthwise direction of the plate body 2 is referred to as the front-rear direction Y
- the height direction of the plate body 2 is referred to as the up-down direction Z.
- the plate body 2 has a horizontally long shape, and has a front wall 4, a rear wall 5 facing the front wall 4, and a left side wall 6 and a right side wall 7 formed by connecting the front wall 4 and the rear wall 5. .
- the plate body 2 is made of a transparent material such as polypropylene, polystyrene, acrylic, or glass.
- the size of the plate body 2 is designed so that the length L1 in the left-right direction X is 5.5 cm to 7.5 cm, and the length L2 in the front-rear direction Y is 2 cm to 3.5 cm.
- the plate body 2 is formed with a first well 8, a second well 9 and a third well 10 each having a substantially semispherical shape in the horizontal direction X.
- the first to third wells 8 to 10 are designed to have substantially the same diameter and depth.
- a first well 8 is filled with an equilibration solution (ES), and a second well 9 and a third well 10 are filled with a vitrification solution (VS).
- ES equilibration solution
- VS vitrification solution
- the cell vitrification solutions described above are used as equilibration solution ES and vitrification solution VS.
- the vitrification fluid VS is a solution containing a cryoprotectant necessary for vitrifying cells, and the vitrification fluid VS contains basal medium (MEM), antibiotics, and the like.
- the equilibrium solution ES is a solution containing a cryoprotectant at a lower concentration than the vitrification solution VS, and the equilibrium solution ES contains a basal medium (MEM) and antibiotics.
- cell vitrification solutions with different thickener (thickening polysaccharide) concentrations and viscosities are used as the equilibrium solution ES and the vitrification solution VS.
- concentration of the thickening agent in the equilibrium liquid ES is lower than the concentration of the thickening agent in the vitrification liquid VS.
- the viscosity of the thickening agent in the equilibrium liquid ES is preferably lower than the viscosity of the thickening agent in the vitrification liquid VS.
- the concentration of the thickening agent in the equilibrium liquid ES is set to 0.048% by mass
- the concentration of the thickening agent in the vitrification liquid VS is set to 0.060% by mass.
- the viscosity of the thickener in the equilibrium liquid ES is preferably 2.0 to 4.0 mPa ⁇ s
- the viscosity of the thickener in the vitrification liquid VS is preferably 7.0 to 13 mPa ⁇ s.
- Equilibrium solution ES (first cell manipulation solution) in first well 8
- vitrification solution VS (second cell manipulation solution) in second well 9
- vitrification solution VS (third cell manipulation solution) in third well 10 solution) is dispensed at 300 ⁇ L each.
- a plurality of fertilized eggs are put into the first well 8 .
- the equilibrium solution ES has a predetermined viscosity
- the fertilized eggs that have been introduced slowly settle down to the bottom. By slowly settling down to the bottom, the whole surface of the fertilized egg is soaked with the equilibrium solution ES, and the inside of the fertilized egg is permeated with the cryoprotectant and equilibrated.
- the equilibrium solution ES has a predetermined viscosity
- the fertilized eggs are less likely to come into contact with each other in the equilibrium solution ES in the first well 8, making it easier to manipulate each cell.
- the fertilized egg and the equilibrium solution ES are aspirated from the first well 8 with a capillary, and the sucked fertilized egg and the equilibrium solution ES are transferred to the second well 9 .
- the vitrification fluid VS has a predetermined viscosity
- the fertilized egg that has been introduced floats slowly to near the surface of the vitrification fluid VS.
- the capillaries are co-washed with the vitrification fluid VS inside the second well 9 and the third well 10, and the floating fertilized eggs and the vitrification fluid VS in the second well 9 are aspirated.
- the sucked fertilized egg and vitrification fluid VS are put into the third well 10 .
- the vitrification liquid VS has a predetermined viscosity
- the fertilized eggs that are put in slowly float in the vitrification liquid VS.
- the capillary is co-washed with the vitrification fluid VS inside the third well 10 .
- the fertilized egg aspirated by the capillary is dropped onto the tip of a rod-shaped cell freezing tool and frozen with liquid nitrogen.
- the cell vitrification solution according to the present embodiment contains a thickener and has a predetermined viscosity, it is possible to adjust the sedimentation speed and floating speed of cells in the cell vitrification solution, It becomes easier to manipulate cells while ensuring safety. Therefore, the work load can be reduced, and the operation time can be shortened.
- concentration of the thickener in the cell vitrification solution is from 0.01% by mass to 0.50% by mass, or when the viscosity of the cell vitrification solution is from 1.5 mPa ⁇ s to 100 mPa ⁇ s has good operability when handling a plurality of cells, and can be operated in a short time.
- the fertilized egg slowly settles in the equilibrium solution ES.
- the entire zygote (especially the lower part) is in contact with the cell vitrification solution for a longer period of time, making the zygote more stable than when the zygote settles in the solution immediately. It can be vitrified.
- the fertilized egg gently touches the bottom of the container, thereby reducing the load on the fertilized egg.
- the fertilized egg floats slowly in the vitrification fluid VS of the second well 9, it is possible to prevent the fertilized egg from being lost in the vitrification fluid VS.
- thickening polysaccharides described above it is particularly useful as a cell vitrification solution containing only xanthan gum.
- Cell vitrification solutions containing two or more of polysaccharide thickeners such as xanthan gum, carrageenan, gellan gum, locust bean gum, guar gum and diutan gum are also highly effective.
- concentration of the thickening agent was 0.03% by mass to 0.30% by mass, the operability of the cells was remarkably good. again,
- the cell cryopreservation method according to the present embodiment is performed using the above-described cell vitrification solution, changing the concentration and viscosity of the thickener in the equilibrium solution ES and the vitrification solution VS, Adjusting the speed improves cell manipulation. Therefore, the time required for the fertilized egg to reach the desired shape is shorter than in conventional cryopreservation methods. Therefore, with this cell cryopreservation method, cells can be frozen more safely, and the cell cryopreservation method according to this embodiment is highly useful.
- the cell manipulation solution according to this embodiment can also be used as a cell thawing solution for vitrification-frozen cells.
- This cell lysing solution is used for the purpose of improving the operability of the cell lysing operation.
- a vitrification cryopreservation medium for example, a vitrification cryopreservation medium for animal cells described in Patent Document 2
- a thawing liquid for thawing cells has been used as a thawing liquid for thawing cells.
- this solution has a problem that the cellulosic substance precipitates when heated to about 37 degrees.
- the cell lysing solution according to the present embodiment contains at least one of polysaccharide thickeners such as xanthan gum, carrageenan, gellan gum, locust bean gum, guar gum, and diutan gum. Does not contain ethyl methyl cellulose.
- the thickener is preferably contained at a concentration of 0.01% by mass to 0.50% by mass with respect to the cell lysis solution. Moreover, it is most preferable that it is 0.03 mass % to 0.30 mass %. If the concentration of the thickening agent is lower than 0.01% by mass, the thickening property may be lost and the operability may deteriorate. On the other hand, when the concentration of the thickening agent is higher than 0.50% by mass, the viscosity of the cell lysis solution increases and the operability of cells in the cell vitrification solution decreases.
- the viscosity of the cell lysing solution is preferably from 1.5 mPa ⁇ s to 100 mPa ⁇ s. If the viscosity of the cell lysing solution is less than 1.5 mPa ⁇ s, the thickening property may be lost and the operability may deteriorate. On the other hand, if it is more than 100 mPa ⁇ s, the viscosity of the cell lysis solution increases, and the operability of cells in the cell vitrification solution decreases.
- FIG. 1A This cell thawing instrument 1A can be used when thawing various cells.
- an example of use for melting a frozen fertilized egg (blastocyst) will be described.
- the cell lysis instrument 1A has a horizontally long plate body 2A in the left-right direction X, as shown in FIG.
- a sealing material may be provided on the upper surface of the plate body 2A in a detachable manner.
- the plate body 2A has a front wall 4A, a rear wall 5A facing the front wall 4A, and a left side wall 6A and a right side wall 7A formed by connecting the front wall 4A and the rear wall 5A.
- a transparent and light material such as polypropylene, polystyrene, polycarbonate, or acrylic is used for the plate body 2A.
- a semispherical first well 8A, a semispherical second well 9A, a semispherical third well 10A, and a substantially trapezoidal fourth well 11 in plan view are provided in the left-right direction X.
- the first well 8A, the second well 9A and the third well 10A are formed so as to protrude from the bottom wall of the groove of the plate body 2A.
- the first well 8A is formed on the right side of the fourth well 11 in the horizontal direction X
- the second well 9A is formed on the right side of the first well 8A
- the third well 10A is formed on the right side of the second well 9A.
- the fourth well 11 has a bottom wall 13 having a sloped portion 12 that slopes from left to right in the left-right direction X.
- the fourth well 11 is filled with a melting solution TS (Thawing Solution).
- the first well 8A is filled with a dilution solution DS (Dilution Solution)
- the second well 9A is filled with a washing solution WS1 (Washing Solution 1)
- the third well 10A is filled with a washing solution WS2 (Washing Solution 2).
- the cell lysing solution according to this embodiment is used as a lysing solution TS, diluent DS, and washing solutions WS1 and WS2.
- the lysate TS and the diluent DS contain basal medium (MEM), antibiotics, cell-impermeable dehydration-promoting substances (eg, trehalose), and the like.
- Wash solutions WS1 and WS2 contain basal medium (MEM) and antibiotics, but do not contain cell-impermeable dehydration-promoting substances (eg, trehalose).
- cell lysis solutions with different thickener concentrations and viscosities are used as the lysis solution TS, diluent solution DS, and washing solutions WS1 and WS2.
- the concentration and viscosity of the thickener in the melt TS are preferably higher than the concentrations and viscosities of the thickener in the diluent DS and the cleaning liquids WS1 and WS2.
- the concentration of the thickening agent in the melt TS is 0.06% by mass
- the concentration of the thickening agent in the diluent DS is 0.06% by mass
- the concentration of the thickening agent in the cleaning liquids WS1 and WS2 is 0.06% by mass.
- the viscosity of the thickener in the melt TS is 7.0 to 15 mPa ⁇ s
- the viscosity of the thickener in the diluent DS is 2.5 to 4.0 mPa ⁇ s
- the viscosity of the thickener in the cleaning liquids WS1 and WS2 is The viscosity is preferably 1.5 to 2.0 mPa ⁇ s.
- Thawing solution TS (fourth cell thawing solution) in fourth well 11, diluent DS (first cell thawing solution) in first well 8A, washing solution WS1 (second cell thawing solution) in second well 9A,
- the third wells 10A are each filled with a washing solution WS2 (third cell lysing solution). Then, the fertilized egg frozen on the cell manipulation instrument is immersed in the thawing solution TS. Since the melting liquid TS has a predetermined viscosity, the melting liquid TS slowly permeates the frozen fertilized egg. Thereafter, the thawed fertilized egg is separated from the cell manipulation instrument and slowly floats in the lysing solution TS.
- the floating fertilized eggs are put into the diluent DS in the first well 8A and diluted for 3 minutes.
- the diluted fertilized egg is put into the washing solution WS1 of the second well 9A and washed for 5 minutes. At this time, it is confirmed that the fertilized egg has the desired shape. After confirming the form, it is put into the washing liquid WS2 of the third well 10A to complete the washing. After completion of washing, the fertilized egg is used for embryo transfer or the like.
- the cell lysing solution according to the present embodiment contains a thickening agent, which allows the cell floating speed in the cell lysing solution to be adjusted, thereby facilitating the cell thawing operation while ensuring safety.
- a thickening agent which allows the cell floating speed in the cell lysing solution to be adjusted, thereby facilitating the cell thawing operation while ensuring safety.
- concentration of the thickening agent in the cell lysing solution is 0.01% by mass to 0.50% by mass, or when the viscosity of the cell lysing solution is 1.5 mPa ⁇ s to 100 mPa ⁇ s.
- the thickening polysaccharides described above it is particularly useful as a cell lysing solution containing xanthan gum.
- the cell lysis solution according to the present embodiment can safely lyse cells without depositing substances even when heated up to 37°C.
- the lysing solution In conventional lysing solutions, the lysing solution easily permeates the fertilized eggs, so there is a risk that the fertilized eggs may be detached from the cell manipulation instrument immediately after being immersed in the lysing solution, and the fertilized eggs may be lost. Since the melting liquid TS of the present embodiment has a predetermined viscosity, the fertilized eggs immersed in the melting liquid TS are gradually permeated with the melting liquid TS. Since it floats slowly in the TS, it is possible to prevent the fertilized egg from being lost in the melt TS.
- the cell thawing method according to the present embodiment is performed using the cell thawing solution described above, and by changing the concentrations and viscosities of the thickening agents in the lysing solution TS, the diluent DS, and the washing solutions WS1 and WS2, the lysing solution TS It improves the handling of the fertilized egg during isotination and reduces the time it takes for the fertilized egg to reach the desired morphology compared to conventional thawing methods.
- the viscosity of the thickener in the melt TS higher than the viscosity of the thickener in the diluent DS and the washing liquids WS1 and WS2
- the operability of the cells is enhanced. Therefore, cells can be manipulated more safely by this cell thawing method, and the cell thawing method according to this embodiment is highly useful.
- Polysaccharides are not limited to xanthan gum, carrageenan, gellan gum, locust bean gum, guar gum, diutan gum, as long as they are highly safe and have a thickening effect.
- hyaluronic acid, rhamsan gum, hexuronic acid, fucoidan , pectin and the like can also be used.
- the cell manipulation solution can be used as long as it is a solution for manipulating cells other than freezing or thawing of cells.
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Abstract
Description
従来、哺乳動物の卵子等の凍結保存方法として、バイアルやストロー等に、卵や胚等をガラス化液で包被して貼り付け、凍結保存用容器を密封した後、液体窒素に接触させて急速に冷却する方法が知られている(例えば、特許文献1)。
また、損傷をほとんど与えずに受精卵を保存できるガラス化保存技術が桑山らによって報告されている。
本実施形態に係る細胞操作用溶液は、細胞ガラス化用溶液として使用される。
この細胞ガラス化用溶液は、例えば、哺乳類の精子、卵子、胚を凍結保存する際に使用される。この細胞ガラス化用溶液には増粘剤が含まれ、例えば、増粘多糖類であるキサンタンガム、カラギーナン、ジェランガム、ローカストビーンガム、グァーガム、ダイユータンガムの中から少なくとも一つが含有されている。
なお、ヒドロキシプロピルセルロース、ヒドロキシプロピルメチルセルロースやヒドロキシエチルメチルセルロースは含有されていない。
なお、各溶液の粘度は、音叉振動式粘度計(22度±1.0度)を用いて測定した。
本実施形態に係る細胞操作用溶液は、ガラス化凍結された細胞の細胞融解用溶液としても使用することができる。この細胞融解用溶液は、細胞融解操作の操作性を向上させる目的で使用される。
従来、ガラス化凍結保存液(例えば、特許文献2に記載の動物細胞のガラス化凍結保存液)を、細胞を融解させるための融解液として使用することがあった。しかし、この溶液は、約37度まで加温するとセルロース系物質が析出してしまうという課題があった。
第四ウェル11は、図4に示すように、左右方向Xにおいて左方から右方にかけて傾斜する傾斜部12を有する底壁13を備えている。
本実施形態に係る細胞融解用溶液は、融解液TS、希釈液DS、洗浄液WS1、WS2として使用される。
また、本実施形態に係る細胞融解用溶液は、37度まで加温した場合でも、物質が析出せず、細胞を安全に融解することができる。
本実施形態の融解液TSは、所定の粘度を有するため、融解液TS中に浸漬された受精卵には、徐々に融解液TSが浸透し、細胞操作用器具から剥がれた後、ゆっくり融解液TS中をゆっくり浮遊するため、融解液TS中で受精卵を見失うおそれを防止できる。
また、細胞操作用溶液は、細胞の凍結や融解以外でも、細胞を操作するための溶液であれば使用することができる。
1A 細胞融解用器具
2,2A プレート本体(本体部)
3 蓋体
4,4A 前壁
5,5A 後壁
6,6A 左側壁
7,7A 右側壁
8,8A 第一ウェル
9,9A 第二ウェル
10,10A 第三ウェル
11 第四ウェル
12 傾斜部
13 底壁
ES 平衡液(第一細胞操作用溶液)
VS ガラス化液(第二細胞操作用溶液,第三細胞操作用溶液)
TS 融解液(第四細胞操作用溶液)
DS 希釈液(第一細胞操作用溶液)
WS1,WS2 洗浄液(第二細胞操作用溶液、第三細胞操作用溶液)
X 左右方向
Y 前後方向
Z 上下方向
Claims (5)
- 細胞のガラス化凍結又はガラス化凍結された細胞の融解に使用する細胞操作用溶液であって、
増粘剤が含有され、前記増粘剤が、キサンタンガム、カラギーナン、ジェランガム、ローカストビーンガム、グァーガム、ダイユータンガムの中から選択される少なくとも一つである、
ことを特徴とする細胞操作用溶液。 - 前記増粘剤の濃度が、0.01質量%から0.50質量%であり、
粘度が1.5mPa・sから100mPa・sである、
ことを特徴とする請求項1に記載の細胞操作用溶液。 - ジメチルスルホキシド、エチレングリコール、グリセロール、プロピレングリコール、ブタンジオールの細胞膜透過性凍結保護物質の中から選択される少なくとも一つが含まれ、
トレハロース、ポリビニルピロリドン、スクロース、ポリエチレングリコールの細胞膜非透過性凍結保護物質の中から選択される少なくとも一つが含まれている、
ことを特徴とする請求項1又は請求項2に記載の細胞操作用溶液。 - 請求項1に記載の細胞操作用溶液が充填される、少なくとも第一ウェル及び第二ウェルを備えるプレートを用いて、細胞を凍結する細胞凍結保存方法であって、
前記第一ウェルに充填される第一細胞操作用溶液中の増粘剤の粘度が、前記第二ウェルに充填される第二細胞操作用溶液中の増粘剤の粘度よりも低く、
前記細胞を、前記第一ウェル中の第一細胞操作用溶液に浸漬させる第一工程と、
前記第一工程後、前記細胞を前記第一ウェル中の第一細胞操作用溶液から取り出し、前記第二ウェル中の第二細胞操作用溶液に浸漬させる第二工程と、
前記第二工程後、前記細胞を前記第二ウェル中の第二細胞操作用溶液から取り出し、凍結させる第三工程と、を含む、
ことを特徴とする細胞凍結保存方法。 - 請求項1に記載の細胞操作用溶液が充填される、第一ウェル、第二ウェル、第三ウェル、第四ウェルを備えるプレートを用いて、細胞を融解する細胞融解方法であって、
前記第四ウェルに充填される第四細胞操作用溶液中の増粘剤の粘度が、前記第一ウェルに充填される第一細胞操作用溶液、前記第二ウェルに充填される第二細胞操作用溶液及び前記第三ウェルに充填される第三細胞操作用溶液中の増粘剤の粘度よりも高く、
前記細胞を、前記第四ウェル中の第四細胞操作用溶液に浸漬させ、融解する第一工程と、
前記第一工程後、前記細胞を前記第四ウェル中の第四細胞操作用溶液から取り出し、前記第一ウェル中の第一細胞操作用溶液に浸漬させる第二工程と、
前記第二工程後、前記細胞を前記第一ウェル中の第一細胞操作用溶液から取り出し、前記第二ウェル中の第二細胞操作用溶液に浸漬させる第三工程と、を含む、
ことを特徴とする細胞融解方法。
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JP2021000076A (ja) * | 2019-11-28 | 2021-01-07 | リプロサポートメディカルリサーチセンター株式会社 | 細胞を操作する際に使用される器具 |
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JP2000189155A (ja) | 1998-12-25 | 2000-07-11 | Livestock Improvement Association Of Japan Inc | 哺乳動物胚または卵子の保存方法並びに凍結胚または卵子の融解希釈方法 |
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